This product consists of a probe with cable length up to 450 ft (150 m), an interface box, and a laptop computer (customer- or vendor-supplied), plus interlocking aluminum rods for lowering the probe into the borehole or well. A pneumatic packer is used for easy insertion into boreholes. The unit may be used in 2-in. up to 8-in.-dia. boreholes or vertical wells. The flowmeters are used for inflow-outflow analysis, fracture zone location, well-screen positioning, grouting requirements, and recharge zone determination. They are also useful in oil and hazardous waste investigations and remediation.